My only gripe is that it can become very boring very soon because you are always indoors and always with similar environments (i know the original DM was also like that)

If for example they shifted towards a more story oriented/outdoors classic RPG it would be unbelievable good, i would pay $100+ for something similar to a Lands of Lore1: the throne of Chaos remake/spinof from this guys of Legend of Grimrock.